Q1:
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What is the shape of the graph of a normal distribution?
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A. rectangular B. triangular C. bell-shaped D. bi-modal |
Answer 1:
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Q2:
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Approximately what percentage of values lie within two standard deviations of the mean of a normal distribution? |
A. 34% B. 68% C. 95% D. 99% |
Answer 2:
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Q3:
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A normal distribution has a mean of 10 and a standard deviation of 2. What is the probability that a value chosen at random is more than 10? |
A. 0.34 B. 0.475 C. 0.495 D. 0.5 |
Answer 3:
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Q4:
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For the distribution in question 3, what is the probability that a value chosen at random is less than 12? |
A. 0.34 B. 0.5 C. 0.84 D. 0.95 |
Answer 4:
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Q5:
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For the distribution in question 3, what is the probability that a value chosen at random is between 10 and 13?
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A. 0.5 B. 0.4332 C. 0.4987 D. 0.9332
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Answer 5:
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Q6:
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A distribution with the same mean, median and mode is always called a normaldistribution. |
A. True B. False |
Answer 6:
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Q7:
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What is the mean of the standard normal distribution? |
A. 0 B. 0.5 C. 1 D. 50 |
Answer 7:
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Q8:
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Peoples' weights are normally distributed with a mean of 70 kg and a standard deviation of 10 kg.
What percentage of people would have a weight between 60 kg and 80 kg?
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A. 34% B. 68% C. 95% D. 99% |
Answer 8:
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Q9:
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For the people in question 8, what percentage of people would have a weight greater than 45 kg |
A. 49.38 B. 99.38 C. 49.50 D. 99.50
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Answer 9:
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Q10:
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What is the standard deviation of the standard normal distribution? |
A. 0 B. 0.5 C. 1 D. 50 |
Answer 10:
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